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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2344d8f91928b542a3ebe2a43ec0f3743d0e61e1b83a38af006d67ed534b403e' 
  AND token = 'aE7NU8XVtL2dUWrrmx0qozI41uHS5Pf3OHu+/gYCzO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}